Astronomy:Zeta Tucanae

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Short description: Star in the constellation Tucana
Zeta Tucanae
Tucana constellation map.png
Red circle.svg
Location of ζ Tucanae (near center).
Observation data
Equinox J2000.0]] (ICRS)
Constellation Tucana
Right ascension  00h 20m 04.25995s[1]
Declination −64° 52′ 29.2549″[1]
Apparent magnitude (V) 4.23
Characteristics
Spectral type F9.5 V[2]
U−B color index 0.02[3]
B−V color index 0.58[3]
Variable type None[4]
Astrometry
Radial velocity (Rv)8.8 ± 0.02[5] km/s
Proper motion (μ) RA: 1,707.42[1] mas/yr
Dec.: 1,164.30[1] mas/yr
Parallax (π)116.46 ± 0.16[1] mas
Distance28.01 ± 0.04 ly
(8.59 ± 0.01 pc)
Absolute magnitude (MV)4.67[6]
Details
Mass0.99±0.02[7] M☉
Radius1.08±0.08[8] R☉
Luminosity1.26[8] L☉
Surface gravity (log g)4.48[9] cgs
Temperature5,970[9] K
Metallicity [Fe/H]−0.18[9] dex
Rotation31.1±0.1 d[10]
Rotational velocity (v sin i)3.0[11] km/s
Age2.1–3.02[12][13] Gyr
Other designations
ζ Tuc, FK5 10, GC 401, GJ 17, HD 1581, HIP 1599, HR 77, SAO 248163, LHS 5, LTT 167[14]
Database references
SIMBADdata

Zeta Tucanae, Latinized from ζ Tucanae, is a star in the constellation Tucana. It is a spectral class F9.5 main sequence star with an apparent magnitude of +4.23. Despite having a slightly lower mass, this star is more luminous than the Sun.[7] Based upon parallax measurements by the Hipparcos spacecraft, it is approximately 28.0 light years from Earth.[1] This is one of the least variable stars observed during the Hipparcos mission.[4][15]

The composition and mass of this star are very similar to the Sun, with a slightly lower mass and an estimated age of three billion years. The solar-like qualities make it a target of interest for investigating the possible existence of a life-bearing planet.[15]

Based upon an excess emission of infrared radiation at 70 micrometres, this system is believed to have a debris disk. The disk is orbiting the star at a minimum radius of 2.3 astronomical units. It is radiating with a maximum temperature of 218 K.[12] As of 2009, no planet has been discovered in orbit around this star.[16]

The components of this star's space velocity are U = −60, V = −4 and W = −38 km/s. These correspond to the velocity toward the Galactic Center, the velocity along the direction of galactic rotation, and the velocity toward the north galactic pole, respectively.[17] It is orbiting through the galaxy at a mean distance of 8.4 kpc from the Galactic Center and with an orbital eccentricity of 0.16.[15]

See also

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, Floor (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V  Note: see VizieR catalogue I/311.
  2. ↑ Gray, R. O. et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal 132 (1): 161–170, doi:10.1086/504637, Bibcode: 2006AJ....132..161G 
  3. ↑ 3.0 3.1 Johnson, H. L.; Iriarte, B.; Mitchell, R. I.; Wisniewskj, W. Z. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory 4 (99): 99. Bibcode: 1966CoLPL...4...99J. 
  4. ↑ 4.0 4.1 Adelman, S. J. (February 2001). "Research Note Hipparcos photometry: The least variable stars". Astronomy and Astrophysics 367 (1): 297–298. doi:10.1051/0004-6361:20000567. Bibcode: 2001A&A...367..297A. 
  5. ↑ Evans, D. S. (June 20–24, 1966). "The Revision of the General Catalogue of Radial Velocities". in Batten, Alan Henry; Heard, John Frederick. University of Toronto: International Astronomical Union. 1967. pp. 57–63. Bibcode: 1967IAUS...30...57E. 
  6. ↑ Elgarøy, Øystein; Engvold, Oddbjørn; Lund, Niels (March 1999), "The Wilson-Bappu effect of the MgII K line - dependence on stellar temperature, activity and metallicity", Astronomy and Astrophysics 343: 222–228, Bibcode: 1999A&A...343..222E 
  7. ↑ 7.0 7.1 Santos, N. C.; Israelian, G.; Mayor, M. (July 2001). "The metal-rich nature of stars with planets". Astronomy and Astrophysics 373 (3): 1019–1031. doi:10.1051/0004-6361:20010648. Bibcode: 2001A&A...373.1019S. 
  8. ↑ 8.0 8.1 Ghezzi, L. et al. (September 2010), "Stellar Parameters and Metallicities of Stars Hosting Jovian and Neptunian Mass Planets: A Possible Dependence of Planetary Mass on Metallicity", The Astrophysical Journal 720 (2): 1290–1302, doi:10.1088/0004-637X/720/2/1290, Bibcode: 2010ApJ...720.1290G 
  9. ↑ 9.0 9.1 9.2 Castro, S.; Porto de Mello, G. F.; da Silva, L. (May 1999). "Copper and barium abundances in the Ursa Major Moving Group". Monthly Notices of the Royal Astronomical Society 305 (3): 693–700. doi:10.1046/j.1365-8711.1999.02455.x. Bibcode: 1999MNRAS.305..693C. 
  10. ↑ Suárez Mascareño, A. et al. (September 2015), "Rotation periods of late-type dwarf stars from time series high-resolution spectroscopy of chromospheric indicators", Monthly Notices of the Royal Astronomical Society 452 (3): 2745–2756, doi:10.1093/mnras/stv1441, Bibcode: 2015MNRAS.452.2745S. 
  11. ↑ O'Toole, S. J. (2009). "The Frequency of Low-mass Exoplanets". The Astrophysical Journal 701 (2): 1732–1741. doi:10.1088/0004-637X/701/2/1732. Bibcode: 2009ApJ...701.1732O. 
  12. ↑ 12.0 12.1 Trilling, D. E. (2008). "Debris Disks around Sun-like Stars". The Astrophysical Journal 674 (2): 1086–1105. doi:10.1086/525514. Bibcode: 2008ApJ...674.1086T. 
  13. ↑ Mamajek, Eric E.; Hillenbrand, Lynne A. (2008). "Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics". The Astrophysical Journal 687 (2): 1264–1293. doi:10.1086/591785. Bibcode: 2008ApJ...687.1264M. 
  14. ↑ "LHS 5 -- High proper-motion Star". SIMBAD. Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Zeta+Tucanae. 
  15. ↑ 15.0 15.1 15.2 Porto de Mello, Gustavo; del Peloso, Eduardo F.; Ghezzi, Luan (2006). "Astrobiologically Interesting Stars Within 10 Parsecs of the Sun". Astrobiology 6 (2): 308–331. doi:10.1089/ast.2006.6.308. PMID 16689649. Bibcode: 2006AsBio...6..308P. 
  16. ↑ Kóspál, Ágnes; Ardila, David R.; Moór, Attila; Ábrahám, Péter (August 2009). "On the Relationship Between Debris Disks and Planets". The Astrophysical Journal Letters 700 (2): L73–L77. doi:10.1088/0004-637X/700/2/L73. Bibcode: 2009ApJ...700L..73K. 
  17. ↑ Woolley, Richard van der Riet (1970). "Catalogue of Stars within 25 Parsecs of the Sun". Royal Observatory Annals (Herstmonceux, Royal Greenwich Observatory) 5. http://heasarc.gsfc.nasa.gov/W3Browse/all/woolley.html. Retrieved 2009-09-02. 

External links



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